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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9434c1be4f0488f4cbbc7b8c0ace222c5e27cb53c7a2169f5d8169eaa077e0ac' 
  AND token = 'bVcnaKYDHkz6V3fkMQ9brH2Y22KzVkhSyUgvU7LMoRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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