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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7bddda4068a6a69dac4ddbc7048b0437fa9f20b4e3b0476f5f23014ad18434' 
  AND token = 'AYmPotkiXF6YO+jnm+J9G//anU/Ojb3KvYyYTMJWhkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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