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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd98db768f466aef3ef47cc74c8f6427ab2ad6b4f5b107898aea3067fbc6fb08' 
  AND token = '/ECGBSWDbl2IcwU5xK+U7Au/6iLp1siQUNEpRuKyo0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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