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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd706f00ac55e64f2c0e7d88ba72a86b3cd6a119a132fb392e2293a3bb61fb683' 
  AND token = 'o1ZVqpxc6+xHrhBrzap9cZLvDvr/BGeknLw1Ie1r3tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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