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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1ef3bd64a43e4971bb0b62582e74f9c1f2a57cabfd1f9323b9c2fbe6f41fb6' 
  AND token = 'C+VsxnZb7qeJKRo/TRqDkut6wARTquc+oYxhfRgfdG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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