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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df79a9d1e8bd8b889295da27640327df51e6b6999ab7e4b4b8c670a2501248e' 
  AND token = 't1xEpyYd6CRNRymbNkb7+w8l1+hOym8AqPrHQDIdNxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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