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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa08cf04d462c83a2f0a33e4badfb51b2cd3010752cdacb80b1cd1b5e7485d9d' 
  AND token = '5oLYfxgpwEFeaNelQn2giDXqf0re6cNW0rT59gs7c/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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