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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3fbca1b73099e38fedb9e52bec8190a3f0c7f2f0e90a76d8194b0ca6560816' 
  AND token = '8KGz9rup+2F4TqthmDb6PD1CW9hTm4Bc6yR+a9yphaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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