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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f28383adcc5e1337e21c004130e4f5fd2c5865e92aa0d4bfdd9c388ff9ab84d' 
  AND token = '+51Jd9js+1+yQVD/k8P7P3zBgxupfpxA6T54MoSyU4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}