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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ada9294470e464526de3e8776f7e2fd2389c5e6d342e01c9b914658d94d4530' 
  AND token = 'd9U/JZ1ZHpwSgGJGWOUbqAct1t1qp1FK4vRlvHQrnS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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