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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932c984380b849ba57b384556a08db39d1f9587d5ec9cfe60ac4a941a4f3749a' 
  AND token = 'Ugs2D35BOJB0cfHXkJXpukkH5F5u0lXHDh0Vd+ua5gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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