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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191e0525728afe4da5d7f06d4c98907e678e42fd32ae71e16d15db7f18114531' 
  AND token = 'vUKa8VVbBnJEudwPjqTVME9Uu7vOZoRcnhI8y9FJAxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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