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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e04d2d887582d81a6a1122eeac50b1fed5ffb78b5c2c5f0def40f17f1af283' 
  AND token = '8/fHCOCaVEF9bvdn3cKsDxjFztRnm5pkqjXpzTxHzWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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