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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a5d8bbb225e1e87e2caf15d6152a7242979d4f237e45e2cb949f6707442ce7' 
  AND token = 'YXrSxnbrU/5Ck5/geOVK1++K6EHdw91BeRt0+JUF7oQ=' 
  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"
    }
  }
}