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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e2f3528c474939aabf8b7180669a8e225ce102f0b96f8611337530a8dc1834' 
  AND token = 'Qx0+KgN63nkA1y1/kDLIrCALsPuX6rzMt/s107ck39E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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