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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cb0f64dc64152819d895f4260934953862cd117687dba8121676886f3de3fb' 
  AND token = 'Rsli/WRlA8gysbrD4eJHAB8nPS2ehblkQ5aHw0H6VAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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