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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b6d3a9fbea6e24ed2d93befd1a1be9ba4612033bb5350ad9a78fcdb6afdce0' 
  AND token = '+NbeMFvA5RByyYIeRJb9SNUqxc7wZdHSrWKRPGXu2eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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