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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee76a67c30de3f7704973d143d5ba8b2e588fe718c4ef74678a714542fd2df7' 
  AND token = 'zp8kJgfcZ5Iu92VoTql0ZOUvBAA4kn0QWVsndw7rNHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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