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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc965235090d299184d2b7f368c1d27c3cac8a9400807678e53bff82ddd787c' 
  AND token = 'YYofo2ESY9ql02l6XOY7cwyOoe+vMhwOj9sYhTynDmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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