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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fcde7c35376b758735628843cdaf28e905a9b4a4780f7bdb2d0025e6e265f7' 
  AND token = 'Hw5rxFF04vrTwlth1leuf9sEuLf837IRQOUrndJkr/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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