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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922af4bc191ee023b9f209624bcc37e761045c62cfb0a95d1f9095b950d7438a' 
  AND token = 'CYPkdIF7iG9ZZcW/6y+ddNRWOK53YZReH8qzc+8Nugs=' 
  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"
    }
  }
}