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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cab97805723ca0c39c46f42fddaad9425edf89d4fceb63c3c87bfa0f656f78' 
  AND token = 'ilDmjkHYjW6HVe6tPACZH3KNzSdYvZBbgSMEAKNr+3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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