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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b8f101a6061370f94d1edb28e951b31958d88a60ed0b831a93d45053cb41da' 
  AND token = '46Q4CxB7lwtv2HbCIpy/PI5Fol2hyVw95qAga6SrdLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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