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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1070770c3d4841943ac646ceb79abd57e7e549bf0fbe33b1a5ce68631ac94f08' 
  AND token = 'XGGEc94JpfRrXJlTUTyedMnx07b0XM8XRF6epWR+I6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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