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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60ea8b38a53ee6ad7163a2d68ea941668fc82d5ac8af2fa9679187ca71a6af2' 
  AND token = '1rhPcLrr48ro6+GHizkRH160BoIqOQwFvdPhfHNL5RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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