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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '510becbaa92860053e7cc59127db8d87f8f5ca0f6570156da375e6d3f69795d6' 
  AND token = 'YQAc5pvN5I/2ys1napSFDL6KcDji3aVSN2X80Uwn9f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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