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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df18dc156cea2b976ea80ad520bb52f8ab36aa9c18c1ac3850c1281d3bfa1ff' 
  AND token = 'kovi4+eV/pBddiVaqXZ+sI4e0yzXo0QONkN5cDFwz2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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