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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e4e6469c533a1934bea7d8c5e5abfbc1cb44666c32c9d565b68d986dc0cd13' 
  AND token = 'qbAaa4zaCxY0x6i2YRMjnNZ7ArD5TTToB0/eclnqz+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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