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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604c14381e36bcb6ec2523ae1ce6540875e85957861b5276e0d91ff44bbc1a59' 
  AND token = 'pt299QC6ZF8uR4Aegi4uws84mPTbv0riWS8acPmUNww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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