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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a302ba0d794924558164a74d4138ebab5eaba0d67ef310b2b672825d327e7f77' 
  AND token = '6HMWFy+woFmWl7OoUBbyoBWEcvKP5v6p0VlZRvTwSjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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