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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66fc1d44fb82399fb0ae4417d9d5f9642f249bca37bc52d5aeab2ae49db9da9f' 
  AND token = '6mOEMA+yegF/PtG9jrgSvPOd87CTKJRCvGUV5s1tIek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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