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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96eaa76104c52072b2103f9ecd7919af2425d32e24c03055ec5a737d3e55829b' 
  AND token = 'vZktwtz/uZ5ph/3A4OXIHf6B3rk6kd3wqd9Sb2xBbLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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