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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e997bd39b9931b3335a2fc5820480eab3dbb05b5d8d5981357ded16b499be3' 
  AND token = 'aRXejMuYAI0Fkf1Nn7yUnl8LZB8HMgbf9EXz3DgXs6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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