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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bbc490098c0949b2d9dca34a7d53ebae95a53f5bb5f43239983624cd06eb0b' 
  AND token = 'V7DnyWm4OMT8wB8QFPQfXhN1ZvBo/ssDcJBjd+xZAcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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