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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d1598469ab44d9f8d73ba81e46e56cc731dc8230a31911a09085f9c89da240' 
  AND token = 'nuhhk90MrjVqFBupcmdddvBzNpnU4LoCgN/3PbGyidg=' 
  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"
    }
  }
}