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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea04d782fbc5a6b61e3c7264ddf879e546f8db8392dfb0a471362ae6f3281ab' 
  AND token = '8CaVXKF6UcXt2xqHXenm/EotqLPtRKc87Inu1iKoU10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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