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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cc1b83bdf2bcbf23825f9941f0cfef15e905e7f7aa0d8d44718002117ad579' 
  AND token = '14sRERfmLl0TtaIqceX04+jdv4WbAiWxEAkwGIzrtgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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