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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18cb56e06c90740b6549f767fcb7c87706bd7f3fd17cde6e235c7250c7a4fa8a' 
  AND token = 'dXFWuhS2Fj/nappu2QhRw2KdnybUL5GTnX8p2FdrkHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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