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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd915eafd175d67929deb2f3042a312512be988e5cd6a7e967ec414a58a2cf0ce' 
  AND token = 'jbX1EyKUGffsHihQ1dtJ/iHyG7VpYOpUPC1kYtwn3Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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