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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98157639c0192d13f6efab9ba24d5ce3604d174e0f9a1c2e0c8166eb41441af6' 
  AND token = 'JK2NOcbnJ3BB9GDvm8pfPBr/B9brKdSemJCA6f+dM7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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