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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd4c83c74fa2c18a2e5acbccde7fa81dd8655d4f92ed9ff251b3b9f6ae92112' 
  AND token = 'lcDWI5BJDRj9UGgZyoKrKh2qJVR4DLnnsV1XJqao16g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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