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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7d5ba103e06e5af7567a3213c259235ea5c10141e67aa0d975c566a21c0d61' 
  AND token = 'OYWLhrsIprQZwBr8AyRLdAe6tcO1nj3I8BwY5hX1J4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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