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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0cad7015c8542179bb71b50ede284ddfcc8acca2b40d3eedea1a46096e9f5b' 
  AND token = 'peIW8YksbtcoEHs1OmYdjf6K3Yti5LCpIiELykod91g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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