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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf7b83408f0bdf36846f12c2416a94967b1be06bc505c42dfe94b4e970fbf3e' 
  AND token = 'wn6nrez7tyhtqnFO9/SPk5lkNBhWFSRiXRuPINcR6jA=' 
  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"
    }
  }
}