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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51165c1a1a9fe7e4df482720d6629478756ea28e1881d19f8a0f7dd453c05cf9' 
  AND token = 'Dnk+frTtUxDWJuQayaax8d7eYXcKiQGJBIDL3C5c3dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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