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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85160161be31c47158439487ee8041566dee43562c50d3d6540ae2466d3c05be' 
  AND token = 'ldnoVeuLSEl54dW4mZR8QEXMS6S+7NU7s2HLXIsFltA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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