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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fd989a51f17896b40be053190eed2955245cca976a4f8087b542a17bbcf69c' 
  AND token = 'UbGvFxCub8Aq4kFoX1/rNG7tPm77ZRHqvQ8La9rf7bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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