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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c09d4d58186e6a45dee8cf8610b9fcc4de0a14b28ad0661405f6ade039355d' 
  AND token = '99/o0x3y0nRoe2Cx5J7su0xoA2aw+y/taQJM0gMPl3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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